|Noah Webster's Dictionary|
1. (a.) Extinguished; quenched; no longer existing; as, an extinct volcano.
2. (a.) Without a survivor; without force; dead; as, a family becomes extinct; an extinct feud or law.
3. (v. t.) To cause to be extinct.
Int. Standard Bible Encyclopedia
In Job 17:1, "My days are extinct" (za`akh (in Niphal)) and in Isaiah 43:17, "They are extinct" (da`akh), the word "extinct" should be recognized as a form of the participle, equivalent to "extinguished," so that in both passages an action, not merely a state, is indicated.
Extinct (3 Occurrences)
Deuteronomy 25:6 And it shall be, that the first-born which she beareth, shall succeed in the name of his brother who is dead, that his name may not become extinct in Israel. (WBS)
Job 17:1 "My spirit is consumed. My days are extinct, And the grave is ready for me. (WEB KJV JPS ASV DBY WBS RSV)
Isaiah 43:17 who brings forth the chariot and horse, the army and the mighty man (they lie down together, they shall not rise; they are extinct, they are quenched like a wick): (WEB KJV JPS ASV DBY WBS)